Molding-machine



P. W. GATES.

MOLDING MACHINE.

APPLICATION FILED JAN. 17. 1911.

wiala/n Patented June 22, 1920.

P. W. GATES.

MOLDING MACHINE.

APPLICATION FILED JAN. 17, 1917.

2 SHEETS-SHEET 2 Patented June 22, 1920.

#232 wen/Tor.-

A 1 w- & 2am

UNITED STATES PATENT OFFICE.

PHILETUS W. GATES, OF CHICAGO, ILLINOIS, A S SIGNOR TO MUMFORD MOLDING MACHINE COMPANY, OF JERSEY CITY, NEW JERSEY,

A CORPORATION.

, MOLDING-MACHINE.

Specification of Letters Patent.

To all whom it may concern:

Be it .known that I, PHILn'rUs GATES, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Molding-Machines, of which the following is a specification.

This invention relates to molding machines, and has for its object to provide a new and improved form of combination jolt and squeeze ramming machine.

Heretofore 1n a ma ority of machines of this nature it has been necessary to provide two separate carrying plungers or a recessed plunger sliding in a cylinder and upon a trunk or post concentrically mounted in such cylinder. Difficulties of machine construc tion and operation inherent in the latter type, and the greater cost of operation and decreased efliciency in the former type, it is my aim to dispense with in theconstruction of this application.

Another object of my invention is to provide a machine of this type in whicha simple or plain plunger, or piston, reciprocably mounted in a cylinder, is utilized for both the squeezing and jolting operations. Another object is to provide new and improved valve mechanism for performing this function. Still another object is to provide.

Like numerals refer to like elements throughout the drawings, in which 10 designates the base to which are pivotally attached the yoke arms 11, carrying the cross head 12, which in turn carries the squeezing board 13, all of well known construction. The base 10 is provided with a table or plane portion 10 to which is bolted, by suitable bolts 14:, the cylinder 15 havin the exhaust outlet 15, and jolt inlet 15". Feciprocably mounted in the cylinder is the hollow plunger, or piston 16, upon which is mounted thetable 17 clearance spaces 16 existing between the table and interior of the piston 16. The latter is provided with surge ports 16 in its bottom and a by-pass 16 at one side, a striker portion 16 being provided adjacent said by-pass, as shown in Fig. 2. It is to be noted that the plunger, or piston, 16, in so. far as its exterior is concerned is a plain or simple plunger having a plane bottom surface in contradistinction to this type of machine which has a recess extend- I ing upwardly from the bottom thereof. At

the bottom of the plunger is provided a downward projection 15 to insure clearance between the bottom of the plunger and the bottom of the cylinder, when the former is in its lowermost position. Threaded, or otherwise -mounted, in each of the surge ports 16 is a species of check valve 18 having a valve seat 18 therein with which coacts a valve proper 18 provided with the stem 18. -A spring 18 extends between the top ofthe valve casing 18 surrounding the stem 18, and extending between the top of said valve casing and the valve 18. The spring is of such tension as to normally keep the valve l8 off its seat in open position, as will be more fully described hereinafter. A recess, or cavity, 10 is provided in one side of the base 10, and in this casing, or cavity, is inserted a valve block 20, comprising valve construction similar to that shown in the patent to Mumford and Huggins, No. 1,167,511. This block 20 is carried by the plate 20, which is secured by means of bolts, or the like, to the base 10 and cylinder 15, as shown in Fig. 1. An inlet duct 21 communicates with an inlet passage 20 in the block 20, the latter leading to the peripheral chamber 20 which surrounds the valve seat- 20, with which is arranged to coact the valve 20*, the latter being supported in open position by means ofthe detachableplate 20 The valve 20 is provided with an upwardly extending stem 20 which extends upwardly through a suitable aperture in the block 20 and the alining aperture in the base 10, and when in closed position will project upwardly into the cylinder 15 in alinement with the striker. portion 16 of the plunger 16. The chamber 20 is narrowed and extends upwardly some distance around the valve stem 20 as enumerated by the numeral 20 to communicate with the duct 20 which extends upwardly through the plate 20 to communicate with the duct or inlet passage 15 in the cylinder wall, this in turn communicating with the by-pass 16 of the Patented June 22, 1920..

piston when the latter is in lowermost position. The end of the bypass 16, adjacent the cylinder wall, is larger than the intake 15 and of less diameter than the distance between such inlet passage 15 and the exhaust passage 15, for a purpose to be hereinafter described. A bleed passage 20 extends between the inlet duct 20 and to beneath the valve 20, as shown by dotted lines in Fig. 2, this passage being of constricted size. The tube 21 leads to the jolt controlling valve casing 25, a suitable aperture being provided therethrough, as indicated by numeral 25, and an air supply pipe communicating with the opposite side of such aperture. Above the aperture 25 is a second cross-aperture 25, from one end of which leads the tube 27 communicating with the exhaust passage 15 of the cylinder 15. In its opposite end the aperture 25 communicates with the open air. A suitable tapered plug valve 25 is rotatably mounted in the casing 25 and is provided with crossapertures 25 and 25, respectively the same being so arranged that when the handle 25, attached to the stem of the plug 25, is properly rotated, operating fluid, such as air, will flow from the pipe 26 through the tube 21. The air from the cylinder 15 may exhaust through the tube 27 to the atmosphere when the valve plug 25 is rotated to position permitting flow oi": air from pipe 26 to pipe 21. be operated to prevent both flows as shown in Fig. 2. The duct 15 communicates with a tube, or duct, 30, leading to the valve casing 31 which is a well known form of three way valve, having the valve proper 31 with a stem 31 engaged by the operating handle 31. An air supply duct 31 communicates with the interior of the casing 31, and the proper manipulation of the handle'31 will result in the admission of air through the passage 15 to the cylinder beneath the plunger 16. The second manipulation will open an exhaust in the casing 31 and permit exhaust of air from the cylinder. Similarly, the manipulation of the valve 31" to a third position will close the flow of air in either direction therethrough.

In the operation of my machine for jolting, the valve 25 is moved to open position, whereupon air, or other operating fluid, will flow into the passage 20", over the valve 20 and upwardly through the passage 20, passage 15, through the by-pass 16 to be neath the plunger 16. Such admission at relatively high pressure will immediately close the surge port valve 18" against the action of the springs 18, and the cylinder 16 will be rapidly raised until the by-pass 16 passes out of register with the inlet passage 15 substantially cutting 011' further flow of air into the cylinder. The air already admitted thereto continues to expand slightly,

Similarly the handle 25 may 20 and the stem 20 to project upwardly into the cylinder 15. As soon as the by-pass 16 registers with the exhaust passage 15, a large portion of the entrapped operat ing fluid will exhaust therethrough resulting in an instant reduction of pressure in the cylinder, whereupon the compression of the springs 18, the latter having been properly' constructed, will operate to open the valves 18, permitting the balance of the entrapped air to flow therethrough, the piston rapidly dropping to impact or press upon the bottom of the cylinder. During this movement to final position, the striker portion 16 of the cylinder contacts with the valve stem 20 and positively moves the same to open position, whereupon the above described cycles of operations will be repeated, this repetition being comparatively rapid and being known as jolting.

lVhen the jolting operation is completed, the handle 25 is moved to closed position,

thus closing the air supply through the'pipe 21 and at the same time closing the exhaust 15, 50 that when air is admitted for squeezing, the air will not escape through 15 when the passage 16 registers with 15 and also when the bottom of the piston 16 rises above 15;

' W'hen it is desired to squeeze the mold against the squeezer board 13, assuming the valve 25 to be in closed position, the valve 31 is moved to position, admitting operating fluid through the ducts 30 and 15 until the plunger is raised sufficiently to effect the squeezing operation, whereupon the operator may move .the handle 31 to position, permitting exhaust from the cylinder.

It will be obvious that I have provided a structure very much simpler than anything heretofore existing in the molding machine art, and I have provided a compact and efiicient structure effecting the objects recited in the preamble.

It will be obvious that my invention is susceptible to modifications and I do not wish to be restricted to the form shown save as defined in the appended claims.

What I claim is:

1. In a machine of the class described, a cylinder, a plunger reciprocably mounted therein, valved means to suppl to said cylinder or cut off therefrom air or squeezing, valve means to control automatically the reciprocation of said plunger for jolt ramopen or close the supply of actuating fluid to said automatic valve means and simultaneously to open and close said exhaust port.

2. In a machine of the class described, a cylinder, a plunger reciprocably mounted therein, valved means to supply to said cylinder or cut off therefrom air for squeezing, an automatic valve means to control jolt ramming reciprocation of said plunger, a fluid supply duct communicating With said automatic valve means, an exhaust duct leading from said cylinder for exhaust of actuating fluid therefrom during jolt ramming, and a common valve to open and close said ducts simultaneously.

3. In a machine of the class described, a base portion having a recess therein, a cylinder carried by said base, a valve block carried in said recess, a supply duct leading to and through said block to the interior of said cylinder, a valve carried by said block to control automatically the jolting of said plunger, a second supply duct leading to said cylinder, a manually operable valve controlling the supply of air through said supply duct, said last-mentioned valve being provided with means to permit exhaust of air from said cylinder during jolting, and a valved duct to supply air to said cylinder for squeezing.

'4. In a machine of the class described, a cylinder, a plunger reciprocably mounted therein, a jolt-controlling valve means located beneath said plunger, a manually operable valve member controlling the supply of operating fluid to said jolt-controlling valve and simultaneously controlling the exhaust of operating fluid from said cylinder, a duct member constructed and arranged to supply operating fluid to said cylinder beneath said plunger for squeezing, and a valve member manually operable to admit such supply and to permit exhaust of such squeezing fluid from said cylinder.

5. In a machine of the class described, a cylinder, a plunger reciprocably mounted therein, a jolt-controlling valve means located beneath said plunger, a manually operable valve member controlling the supply of operating fluid to said jolt-controlling valve and simultaneously controlling the exhaust of operating fluid fromsaid cylinder, a duct member constructed and arranged to supply operating fluid to said cylinder beneath said plunger for squeezing, and a valve member manually operable to admit such supply -and to permit exhaust of such squeezing fluid from said cylinder, the last-named valve means also being operable to shut oil supply and exhaust of said squeezing fluid.

6. In a machine of the class described, a cylinder, a plunger reciprocably mounted therein, surge ports in the bottom of said plunger, valves for said ports, means to maintain said valves normally in open position, and valved means to admit operating fluid under pressure beneath said plunger for squeezing, said valves moving under said pressure to closed position, and means to admit and control operating fluid for jolting. I

In testimony whereof I have subscribed R. H. WOODLAND, A. F. JENSEN. 

